Bent pipe



B. DE HIMILLER ed Feb. 10, 1954 May 19, 1936.

' ATTORNEYS m Patented May 19, 1936 I I 'UNITED STATES PATENT OFFICEBENT PIPE Bruce De Haven Miller, Louisville, Ky., assignor to TheGirdler Corporation, Louisville, Ky., a corporation of DelawareApplication February 10, 1934, Serial No. 710,631

1 Claim. (01.138 47) This invention relates to straight pipe sectionscompleted bend, and. side extensions coacting having curved endportions. In my improved with the curved base to form a channel orgroove device, the bend at the end of the pipe section which issemicircular in cross-section, and into may be easily formed withoutchanging the wall which the pipe section is forced. An external 5thickness, and without subjecting the pipe secpivotally mounted die l8for the outer or long ra- 5 tion to excessive stresses. dius side of thebend has a straight concave die The main object is to provide as a newarticle surface 19 of semicircular outline, this surface of manufacture,a straight pipe section made of coacting with the die' surface H toencompass ductile, weldable material, and'having an end therewith theentire periphery of the pipe sec- 10 portion bent in a curve andextending through tion. Also cooperating with the fixed external 10 anarc of approximately 45. Two pipe sections die H3 is an internal mandrel2| which has a of this type can be connected together at rightcross-section corresponding to the inner crossangles to each other by asingle weld along the section of the pipe section, and which is adaptedabutting edges of the bends, thereby simplifying to engage the innersurface of the pipe section the installation of a pipe line, andreducing its Ill along the radial plane of the section. The 15 cost. Thebends may be readily formed on the mandrel 2! is advantageously inbulbous or pipe sections at the time and place of use. spherical form,and is rigidly connected to the I In the accompanying drawing die it.

Fig. 1 is a side view of a pipe section before The die 58 and themandrel 2! are arranged being subjected to a bending operation. tofollow the same circular movement in accord- 20 Fig. 2 is a side view ofa pipe section after ance with the radius of the completed bend. Forbending. that purpose, the die I8 is integral or otherwise Fig. 8 is asection through one form of my imconnected to a yoke 22, straddling thebase l2 proved device which may be employed for formand having a pair ofspaced flanges 23 engaging 25 ing the terminal bend, and shows the pipesecthe sides of the base 52, and pivotally connected 25 tion of Fig. 1clamped in position before being thereto by means of a pivot bolt 24.The yoke subjected to. the operation of the device. is provided with asuitable handle 25 for swing- Fig. 4 is a section taken on the line 4-4of ing it about its pivotal connection either man- Fig. C, and i uallyor by power means.

Fig. 5 is a section similar to Fig. 3, but showing Connected to the yoke22 by any suitable 30 the parts in the position which they assume inmeans, as for instance screws 26, is an arm or the bending operation.shank 2'! for supporting the mandrel 2|. The

In forming my pipe bend, I use a straight pipe shank 21 presents ashoulder 28 which may exsection it made of ductile, weldable materialtend at an angl rr p in to he n l of such as wrought iron. This is outdiagonally at the diago end of the p p t on "J Shown 35 an angle ofapproximately 45 at the end where in gand Which Serves 0 engage d diathe bend is to be formed, so that at the comonal end to determine theclamped position of pletion of the bending operation, the outer end S dSect on during the bending p at nof the bend will lie approximatelyalong radial The pivot bolt 24 is located with its axis at plane of thebend. The bending may be effected the Center Curvature 0f the Completedd, 40 by means of the device shown in Figs. 3, 4 and 5, S t theSwingeble die and and e 2| and. in which the pipe section may be clampedwill have movements concentric with the base during the bendingoperation. curvature of the die surface H.

The device in the form shown includes a base n bending a p Section ymeans of the de- I2 having a semi-cylindrical groove l3 for seat- Vieeshown, the yoke 22 is swung into th p si- 45 ing the pipe section, and aclamping section l4 tion shown in Fig. 3, with the inner side thereofsecured to the base l2 by means of bolts l5, and abutting one side ofthe clamping bracket II. also having a semi-cylindrical groove for en-Th Shank Will extend axially the pe gaging the upper portion of the pipesection. formed between the base I2 and the clamping The bending meansincludes a fixed external 'b The pipe is then'inserted a a y 50 die I6formed on or otherwise connected to the n Said Opening and into the p nShown in base 2, and in and over which the inner or short F gand rotatedif necessary to b ing the diradius side of the bend is shaped. This diepre a o a e d thereof into abutt ng engagement sen-ts a surface I!having a convex base curved W th the diagonal Shoulder In this p on,

i concentrically with the center of radius of the t leng S Of the p peSection will be in an '55 uppermost position. The pipe section in maythen be clamped in position by tightening the bolts IS.

The handle 25 is then operated to swing the yoke 22 downwardly to theposition shown in Fig. 5. During this operation, the end of the pipesection in will be curved longitudinally, the portion of the mandrel 2iengaging the shorter side of the pipe forcing said side into the curveddie surface 11, and the die [8 forcing the longer side of the pipe overthe moving mandrel 2i. The mandrel also serves as a die and engages theentire inner periphery of the pipe section during 'the drawingoperation, and is moved during the bending operation to more effectivelystretch the metal during the drawing operation so as to form a bendhaving a more uniform thickness and less inherent strains. The diagonalend of each pipe section is cut at such an angle that the completion ofthe bend operation illustrated in Fig. 5 will leave the outer end of thebend formed substantially in the same plane with a radial plane of thebend, thereby minimizing or eliminating waste of material caused by thetrimming or facing of the end of the bend. The resultant article ofmanufacture formed as shown in Fig. 2 may be chamfered at the outer endof the bend in preparation for the welding process.

The bending device is of such a nature and its operation is so simplethat it may be easily carried to the place where the pipe line is to beerected and there used.

A bend of comparatively short radius, for instance not xeceeding one andone-half times the inside diameter of the pipe, can be made by means ofmy improved device. A pipe section having a bend of such short radius ishighly desirable for certain purposes. of such short radius but of agreater angle than 45 would have greater inherent strains due to theupsetting of the material in the pipe-section during bending operation.By forming half of a 90 fitting at the end of each pipe section, Iproduce a bend having a more uniform thickness and less inherentstrains. Furthermore, the smaller angle permits the pipe section to becold drawn more easily.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is:-

As a new article of manufacture a substantialiy straight pipe made ofductile weldable metal and having at one end thereof and integraltherewith a curved end section terminating in a plane at an angle of 45to the axis of the pipe and radially to the axis of curvature of saidend section, the walls of said pipe and its end section being ofsubstantially uniform thickness throughout, and the internal andexternal diameters being also uniform, said pipe being adapted to bewelded to a similar pipe with the curved sections abutting in said planeto form a 90 bend with the pipes at right angles to each 1 other.

BRUCE DE HAVEN MILLER.

A drawn pipe bend-

